1 #include <linux/console.h> 2 #include <linux/kernel.h> 3 #include <linux/init.h> 4 #include <linux/string.h> 5 #include <linux/screen_info.h> 6 #include <linux/usb/ch9.h> 7 #include <linux/pci_regs.h> 8 #include <linux/pci_ids.h> 9 #include <linux/errno.h> 10 #include <asm/io.h> 11 #include <asm/processor.h> 12 #include <asm/fcntl.h> 13 #include <asm/setup.h> 14 #include <xen/hvc-console.h> 15 #include <asm/pci-direct.h> 16 #include <asm/fixmap.h> 17 #include <asm/pgtable.h> 18 #include <linux/usb/ehci_def.h> 19 20 /* Simple VGA output */ 21 #define VGABASE (__ISA_IO_base + 0xb8000) 22 23 static int max_ypos = 25, max_xpos = 80; 24 static int current_ypos = 25, current_xpos; 25 26 static void early_vga_write(struct console *con, const char *str, unsigned n) 27 { 28 char c; 29 int i, k, j; 30 31 while ((c = *str++) != '\0' && n-- > 0) { 32 if (current_ypos >= max_ypos) { 33 /* scroll 1 line up */ 34 for (k = 1, j = 0; k < max_ypos; k++, j++) { 35 for (i = 0; i < max_xpos; i++) { 36 writew(readw(VGABASE+2*(max_xpos*k+i)), 37 VGABASE + 2*(max_xpos*j + i)); 38 } 39 } 40 for (i = 0; i < max_xpos; i++) 41 writew(0x720, VGABASE + 2*(max_xpos*j + i)); 42 current_ypos = max_ypos-1; 43 } 44 #ifdef CONFIG_KGDB_KDB 45 if (c == '\b') { 46 if (current_xpos > 0) 47 current_xpos--; 48 } else if (c == '\r') { 49 current_xpos = 0; 50 } else 51 #endif 52 if (c == '\n') { 53 current_xpos = 0; 54 current_ypos++; 55 } else if (c != '\r') { 56 writew(((0x7 << 8) | (unsigned short) c), 57 VGABASE + 2*(max_xpos*current_ypos + 58 current_xpos++)); 59 if (current_xpos >= max_xpos) { 60 current_xpos = 0; 61 current_ypos++; 62 } 63 } 64 } 65 } 66 67 static struct console early_vga_console = { 68 .name = "earlyvga", 69 .write = early_vga_write, 70 .flags = CON_PRINTBUFFER, 71 .index = -1, 72 }; 73 74 /* Serial functions loosely based on a similar package from Klaus P. Gerlicher */ 75 76 static int early_serial_base = 0x3f8; /* ttyS0 */ 77 78 #define XMTRDY 0x20 79 80 #define DLAB 0x80 81 82 #define TXR 0 /* Transmit register (WRITE) */ 83 #define RXR 0 /* Receive register (READ) */ 84 #define IER 1 /* Interrupt Enable */ 85 #define IIR 2 /* Interrupt ID */ 86 #define FCR 2 /* FIFO control */ 87 #define LCR 3 /* Line control */ 88 #define MCR 4 /* Modem control */ 89 #define LSR 5 /* Line Status */ 90 #define MSR 6 /* Modem Status */ 91 #define DLL 0 /* Divisor Latch Low */ 92 #define DLH 1 /* Divisor latch High */ 93 94 static int early_serial_putc(unsigned char ch) 95 { 96 unsigned timeout = 0xffff; 97 98 while ((inb(early_serial_base + LSR) & XMTRDY) == 0 && --timeout) 99 cpu_relax(); 100 outb(ch, early_serial_base + TXR); 101 return timeout ? 0 : -1; 102 } 103 104 static void early_serial_write(struct console *con, const char *s, unsigned n) 105 { 106 while (*s && n-- > 0) { 107 if (*s == '\n') 108 early_serial_putc('\r'); 109 early_serial_putc(*s); 110 s++; 111 } 112 } 113 114 #define DEFAULT_BAUD 9600 115 116 static __init void early_serial_init(char *s) 117 { 118 unsigned char c; 119 unsigned divisor; 120 unsigned baud = DEFAULT_BAUD; 121 char *e; 122 123 if (*s == ',') 124 ++s; 125 126 if (*s) { 127 unsigned port; 128 if (!strncmp(s, "0x", 2)) { 129 early_serial_base = simple_strtoul(s, &e, 16); 130 } else { 131 static const int __initconst bases[] = { 0x3f8, 0x2f8 }; 132 133 if (!strncmp(s, "ttyS", 4)) 134 s += 4; 135 port = simple_strtoul(s, &e, 10); 136 if (port > 1 || s == e) 137 port = 0; 138 early_serial_base = bases[port]; 139 } 140 s += strcspn(s, ","); 141 if (*s == ',') 142 s++; 143 } 144 145 outb(0x3, early_serial_base + LCR); /* 8n1 */ 146 outb(0, early_serial_base + IER); /* no interrupt */ 147 outb(0, early_serial_base + FCR); /* no fifo */ 148 outb(0x3, early_serial_base + MCR); /* DTR + RTS */ 149 150 if (*s) { 151 baud = simple_strtoul(s, &e, 0); 152 if (baud == 0 || s == e) 153 baud = DEFAULT_BAUD; 154 } 155 156 divisor = 115200 / baud; 157 c = inb(early_serial_base + LCR); 158 outb(c | DLAB, early_serial_base + LCR); 159 outb(divisor & 0xff, early_serial_base + DLL); 160 outb((divisor >> 8) & 0xff, early_serial_base + DLH); 161 outb(c & ~DLAB, early_serial_base + LCR); 162 } 163 164 static struct console early_serial_console = { 165 .name = "earlyser", 166 .write = early_serial_write, 167 .flags = CON_PRINTBUFFER, 168 .index = -1, 169 }; 170 171 /* Direct interface for emergencies */ 172 static struct console *early_console = &early_vga_console; 173 static int __initdata early_console_initialized; 174 175 asmlinkage void early_printk(const char *fmt, ...) 176 { 177 char buf[512]; 178 int n; 179 va_list ap; 180 181 va_start(ap, fmt); 182 n = vscnprintf(buf, sizeof(buf), fmt, ap); 183 early_console->write(early_console, buf, n); 184 va_end(ap); 185 } 186 187 static inline void early_console_register(struct console *con, int keep_early) 188 { 189 if (early_console->index != -1) { 190 printk(KERN_CRIT "ERROR: earlyprintk= %s already used\n", 191 con->name); 192 return; 193 } 194 early_console = con; 195 if (keep_early) 196 early_console->flags &= ~CON_BOOT; 197 else 198 early_console->flags |= CON_BOOT; 199 register_console(early_console); 200 } 201 202 static int __init setup_early_printk(char *buf) 203 { 204 int keep; 205 206 if (!buf) 207 return 0; 208 209 if (early_console_initialized) 210 return 0; 211 early_console_initialized = 1; 212 213 keep = (strstr(buf, "keep") != NULL); 214 215 while (*buf != '\0') { 216 if (!strncmp(buf, "serial", 6)) { 217 buf += 6; 218 early_serial_init(buf); 219 early_console_register(&early_serial_console, keep); 220 if (!strncmp(buf, ",ttyS", 5)) 221 buf += 5; 222 } 223 if (!strncmp(buf, "ttyS", 4)) { 224 early_serial_init(buf + 4); 225 early_console_register(&early_serial_console, keep); 226 } 227 if (!strncmp(buf, "vga", 3) && 228 boot_params.screen_info.orig_video_isVGA == 1) { 229 max_xpos = boot_params.screen_info.orig_video_cols; 230 max_ypos = boot_params.screen_info.orig_video_lines; 231 current_ypos = boot_params.screen_info.orig_y; 232 early_console_register(&early_vga_console, keep); 233 } 234 #ifdef CONFIG_EARLY_PRINTK_DBGP 235 if (!strncmp(buf, "dbgp", 4) && !early_dbgp_init(buf + 4)) 236 early_console_register(&early_dbgp_console, keep); 237 #endif 238 #ifdef CONFIG_HVC_XEN 239 if (!strncmp(buf, "xen", 3)) 240 early_console_register(&xenboot_console, keep); 241 #endif 242 buf++; 243 } 244 return 0; 245 } 246 247 early_param("earlyprintk", setup_early_printk); 248